Code refine. Check the original length of array to avoid buffer over flow.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qiu Shumin <shumin.qiu@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16539 6f19259b-4bc3-4df7-8a09-765794883524

NetworkPkg/IScsiDxe/IScsiMisc.c

@@ -226,6 +226,7 @@ IScsiLunToUnicodeStr (
   //
   // Remove the last '-'
   //
+  ASSERT (StrLen(Str) >= 1);
   Str[StrLen (Str) - 1] = 0;
 
   for (Index = StrLen (Str) - 1; Index > 1; Index = Index - 2) {